this post was submitted on 11 May 2025

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A German Experiment Proved That Simple Concrete Spheres Make Fantastic Batteries. Now, California Plans To Submerge A 9-Meter Diameter Sphere In The Ocean And Is Already Planning Versions Of 30 Meters (farmingdale-observer.com)

submitted 1 day ago by Dadifer@lemmy.world to c/science@lemmy.world

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[–] carl_dungeon@lemmy.world 10 points 1 day ago (1 children)

Thanks for the insight, I’m not a mechanical engineer, I’m a software engineer :) The walls on these spheres have got to be pretty thick- 400 tonnes is no joke. 3/4 of a meter if I had to guess.

[–] A_A@lemmy.world 9 points 1 day ago (1 children)

Perfect guess ! (afaik) ρ(concrete) ≈ 2.5 tons/m³
so full sphere ≈ (2.5 x 382) tons = 955 tons
they have 400 t so the cavity removes :
955 - 400 = 555 t ... so 7.51m diam. cavity
... so, yes 3/4m thick wall 😌👍 !

[–] Cocodapuf@lemmy.world 4 points 11 hours ago* (last edited 11 hours ago)

That's exactly the way I would have calculated it, glad someone beat me to it though. Thanks!